Been with them for like 3 months now and everything seems outstanding. Not a single down time according to a 3rd party monitor service.
The panel is thus far the best I've used - best balanced in simplicity and features. Though the reselling part is hardly useful IMHO.
I've only resorted to the live support once and it's actually a minor issue involved with php file uploading. The staff was helpful and got it cleared out in just a few minutes.
To sum up, It's definitely worth the money if you are not technical enough and just want to focus on marketing your websites.